class_docstr: wappwer of abstrcat Loss 
code: def __call__(self, **kwargs):
      name = kwargs.get("name")
      kwargs.pop("name")
      with tf.variable_scope(name):
          loss = self.call(**kwargs)
      summary.scalar(name, loss)
      return loss
  
file_path: delta/delta/utils/loss/base_loss.py
imports: import abc
  import delta.compat
  from delta.utils import summary
label_desc: Use image node_id 3 for calling the Loss obj's underlying member method code with example usage: obj.__call__() and returns: loss